Cities of the sky

March 02, 2011 |

According to TheWall Street Journal, the Silk Road of the future—from Dubai to Chongqing to Honduras—is taking shape in urban developments based on airport hubs. Welcome to the world of the 'aerotropolis.'

The report, “Spending Through the Roof,” says that apartment building owners pay an average of $3,400 a year to replace heat lost through the roof. In taller buildings, the cost can be more than $20,000 a year. Illustration: Urban Green Council